Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, IN, 47405, USA.
Angew Chem Int Ed Engl. 2019 Feb 4;58(6):1719-1723. doi: 10.1002/anie.201812533. Epub 2019 Jan 9.
Two methods are reported for the 1,2- and 1,1-arylboration of α-methyl vinyl arenes. In the case of 1,2-arylboration, the formation of a quaternary center occurred through a rare cross-coupling reaction of a tertiary organometallic complex. 1,1-Arylboration was enabled by catalyst optimization and occurred through a β-hydride elimination/reinsertion cascade. Enantioselective variants of both processes are presented as well as mechanistic investigations.
本文报道了两种方法用于α-甲基乙烯基芳烃的 1,2-和 1,1-芳基硼化。在 1,2-芳基硼化的情况下,通过罕见的三级有机金属配合物交叉偶联反应形成了一个季碳原子中心。通过催化剂优化实现了 1,1-芳基硼化,并通过β-氢化物消除/插入级联反应进行。本文还介绍了这两种方法的对映选择性变体以及机理研究。